One vertex per element, one color per generator, with an edge from x to x·s.
(2,4)(5,6)(7,10)(8,9)(11,12)(13,14,16,18)(15,17,19,20)(21,22,26,29)(23,25,28,35)(24,31,34,27)(30,36,32,33)(1,2,3,4)(6,9)(7,11)(13,15)(14,17)(16,19)(18,20)(21,23,25,29,26,28,35,22)(24,32,33,27,34,30,36,31)(6,9)(10,12)(15,19)(17,20)(21,24,26,34)(22,27,29,31)(23,30,28,32)(25,33,35,36)(2,4)(5,7,8,11)(6,10,9,12)(22,28)(23,29)(25,35)(27,32)(30,31)(33,36)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.